Dimming circuit with saturated semiconductor device

Details Dimming circuit with saturated semiconductor device Dimming circuit with saturated semiconductor device

H - Electricity

05

B

315/44

H05B 41/38 (2006.01) H05B 41/392 (2006.01)

Patent

CA 1056900

DIMMING CIRCUIT WITH SATURATED SEMICONDUCTOR DEVICE ABSTRACT OF THE DISCLOSURE A fluorescent lamp is operated by a-c pulses having a pulse length sufficiently short that the lamp acts like slightly positive impedances. A pulse modulator which pro- duces the pulses has a power transistor biased to saturation. However, varying the base drive of the saturated transistor causes a generally linear change in tube current to permit tube dimming and control. A servo circuit provides feedback control of the base drive to automatically compensate for variable effects to maintain constant tube lighting. Tube dimming is obtained by adjusting the feedback circuits of the servo.

206768

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